Low-noise efficient energy-saving centrifugal fan

Abstract

The invention discloses a low-noise efficient energy-saving centrifugal fan. The low-noise efficient energy-saving centrifugal fan comprises a fan volute, an impeller disc is arranged in the fan volute, the periphery of the impeller disc is provided with an expanding air duct used for expanding and exhausting, a plurality of downwind blades consistent with natural movement tracks of gas are vertically fixed on the front panel of the impeller disc, a driving device is integrally and internally arranged in a sound insulation case, and the sound insulation case and the fan volute are integrally installed on the top surface of a base through a damping device, and a counter-current blocking block for preventing air flow convergence is arranged between one side of the air outlet of a pressure diffusion air duct and the top of the pressure diffusion air duct. According to the low-noise efficient energy-saving centrifugal fan, noise and energy damage are reduced at the same time through the bending direction of the downwind blades, reactive loss is reduced through the counter-current blocking block which can prevent the airflow from flowing back, external noise generated by working of thefan volute body and the driving device is greatly reduced by the external sound insulation case and a damping table, noise reduction treatment is carried out in various aspects from inside to outside,the reactive loss and the energy loss are reduced, and the low-noise efficient energy-saving centrifugal fan is more energy-saving and efficient.

Description

technical field [0001] The invention specifically relates to a centrifugal fan, in particular to a low-noise, high-efficiency and energy-saving centrifugal fan. Background technique [0002] The centrifugal fan is based on the principle of converting kinetic energy into potential energy. The high-speed rotating impeller accelerates the gas, then decelerates and changes the flow direction to convert kinetic energy into potential energy. The main components of the centrifugal fan include the casing, impeller, shaft, damper, and exhaust port. , bearings, bases and other components. The working principle of the centrifugal fan is: when the motor rotates, the impeller of the fan rotates. When the impeller rotates, the air is thrown out from the impeller. When the air in the impeller is discharged and then compressed, the air outside the suction port is pressed into the impeller under the action of atmospheric pressure. Therefore, the impeller rotates continuously, and the air is...

AI Technical Summary

Problems solved by technology

[0003] A lot of noise will be generated when the centrifuge is working. The noise mainly includes the friction and impact noise between the impeller blades and the air and the noise generated by the motor. In order to increase the speed of scraping and driving the air, the general impeller blades bend in the opposite direction to the air flow direction. Ensure that the curved blades can scrape a large amount of air when they rotate, and throw the air into the diffuser chamber of the casing, but this will cause a lot of impact when the blades contact with the air, and the impact will generate a lot of noise. Moreover, a large amount of energy will be lost when the air hits the blades, which will increase the resistance of the blades and reduce the effective power of the centrifugal fan. In addition, when the airflow on the side of the air outlet of the diffuser chamber is pushing the impeller, it is easy to reflow intermittently from the impeller to the side of the diffuser chamber. The initial position reduces the effective air volume of the fan, increases energy consumption, and is not environmentally friendly. Therefore, in response to these problems, we need a centrifugal fan that can reduce noise and save energy.

Images